Sharing One Pre Out

What would be the best way to share my single pre out on my Oppo ha-1 with NuPrime STA-9 and my wharfedale diamond 10 SX sub?

I would try using the XLR balanced outputs for the Nuprime amp and using the RCA outputs for the sub.  It looks like the Oppo HA-1 has separate opamp output buffers for both the RCA and XLR outputs, so this should not present a problem at all.

If this doesn't work, your best bet is to use a splitter cable for the RCA output, something like this:

Thanks for your reply. I'll check with Oppo about that before purchasing cables. 
@auxinput you were correct according to Oppo support.Thanks for the education!